.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about .breadcrumb {
  padding-top: 14px;
  font-size: 13px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover {
  color: var(--blue);
}

.page-about .breadcrumb-link[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* 首屏框景 */
.page-about .about-hero {
  padding: clamp(18px, 3.5vw, 36px) 0 clamp(26px, 4.5vw, 52px);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 16px;
  padding: clamp(22px, 4.5vw, 56px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid var(--line);
  border-radius: 3px;
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 5.2vw, 54px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta-item {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta-num {
  display: block;
  color: var(--blue-deep);
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .about-hero__meta-label {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12.5px;
}

/* 主体骨架 */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3.5vw, 48px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-toc {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  list-style: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  display: block;
  padding: 6px 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-toc__link:hover {
  color: var(--ink);
  border-color: var(--muted);
}

.page-about .about-toc__link[aria-current] {
  color: var(--blue-deep);
  font-weight: 700;
  background: var(--blue-tint);
  border-color: var(--blue);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  padding: clamp(26px, 4vw, 48px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-body > .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-head__title {
  margin: 0;
  max-width: 24em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-head__note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-text p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-inline-link {
  color: var(--blue-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--blue);
}

.page-about .about-inline-link:hover {
  color: var(--blue);
}

.page-about .about-quote {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 18px 20px;
  background: var(--card);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.7;
  color: var(--ink);
}

/* 图片位 */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .figure-media {
  position: relative;
  overflow: hidden;
  background: var(--blue-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .figure-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.6;
}

/* 时间轴 */
.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 12px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid var(--blue);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item:last-child::after {
  display: none;
}

.page-about .stage {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .stage[open] {
  border-color: var(--blue);
  box-shadow: var(--shadow);
}

.page-about .stage__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .stage__summary::-webkit-details-marker {
  display: none;
}

.page-about .stage__num {
  color: var(--blue);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .stage__name {
  flex: 1;
  font-size: 15.5px;
  font-weight: 700;
}

.page-about .stage__toggle {
  color: var(--muted);
  font-size: 15px;
  line-height: 1;
  transition: transform 0.25s ease, color 0.2s ease;
}

.page-about .stage[open] .stage__toggle {
  color: var(--blue);
  transform: rotate(45deg);
}

.page-about .stage__body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
}

.page-about .stage__body p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

/* 原则卡 */
.page-about .principle-list {
  display: grid;
  gap: 14px;
}

.page-about .principle {
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .principle__num {
  margin: 0 0 8px;
  color: var(--orange);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .principle__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .principle__text {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

/* 团队 */
.page-about .role-list {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .role {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .role__name {
  font-size: 14px;
  font-weight: 700;
}

.page-about .role__text {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-about .about-figures {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-figures__item {
  margin: 0;
}

/* 生态与安全 */
.page-about .about-split {
  display: grid;
  gap: 14px;
}

.page-about .about-panel {
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-panel--tint {
  background: var(--blue-tint);
  border-color: var(--blue);
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list__item {
  display: grid;
  grid-template-columns: 9px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-list__item .status-dot {
  margin-top: 8px;
}

.page-about .about-panel__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

/* 规模数据 */
.page-about .about-scale {
  padding: clamp(18px, 3vw, 30px);
  background: var(--blue-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-stat__num {
  display: block;
  color: var(--blue-deep);
  font-size: clamp(19px, 2.6vw, 26px);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
}

.page-about .about-scale__note {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

/* 品牌邀请 */
.page-about .about-cta {
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3.4vw, 36px);
  background: var(--orange-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 响应式 */
@media (min-width: 560px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .role {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .principle-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figures {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    padding: 0 0 0 18px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc__label {
    margin-bottom: 12px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 1px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    position: relative;
    padding: 7px 0;
    background: none;
    border: 0;
    border-radius: 0;
    font-size: 13.5px;
    white-space: normal;
  }

  .page-about .about-toc__link::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 50%;
    width: 9px;
    height: 1px;
    background: var(--line);
    transition: width 0.2s ease, background 0.2s ease;
  }

  .page-about .about-toc__link:hover {
    border-color: transparent;
  }

  .page-about .about-toc__link[aria-current] {
    background: none;
    border: 0;
  }

  .page-about .about-toc__link[aria-current]::before {
    width: 19px;
    background: var(--blue);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .stage__toggle,
  .page-about .about-toc__link,
  .page-about .about-toc__link::before {
    transition: none;
  }
}
<<<END>>>